Scrub scouring gel is an effective, mild abrasive solution that deep cleans without scratching glass or most plastic surfaces. Scrub removes product coatings, alkali residue buildup, pencil marks and grease pencil marks. Use scrub on dive mask lenses & skirts, plastic slates & more. Scrub is made with all natural ingredients, is biodegradable, hypo-allergenic, alcohol and bleach free. Scrub can be applied wet or dry and comes in a 1 fl. oz. (30 ml) convenient push-top cap container. Caution: Do Not Use On Plastic Lenses. Don't just clean it ...scrub it!